Compressor



a. J. DALOZ. COMPRESSOR.

APPLICATION FILED DEC- 27,1919.

1,394,811. Patented Oct. 25, 1921.

FIG.

2 SHEETSSHEET I.

In/v entor 6. J Da/loz By I Af/tormy G. J. DALOZ.

COMPRESSOR.

APPLICATION FILED 050.27. 1919 1,394,811, Patented Oct. 25, 1921.-

2 SHEETSSHEET 2.

AFT/01 1285 PATENT OFFICE.

GASTON JULES miLoz, or conmanvom, FRANCE.

' cournnsson.

Specification of Letters Patent. Patented Oct. 1921.

Application filed December 27, 1919. Serial No. 347,851.

France, have invented certain new and useful Improvements in Compressors, for which I have filed an application in Germany, April 1, 191 1, of which the fOllOWiIlg is a specification.

This invention has for its object to provide an improved compressor of the known type wherein the cylinders are arranged parallelly to one another at different points of a circle, and the heads of the piston connecting rods are pivoted on a cap which is mounted by means of a Cardan joint on the compressor frame, and is provided with a pin driven from an eccentric point of a disk revolving at right angles to the axis of the compressor.

The improved compressor is characterized by the combination of the hereinafter described detail features which facilitate its construction and taking apart, and improve its working.

A constructional form of the improved compressor will now be more particularly described, designed to be mounted upon a vehicle (railroad car or tramcar) and for this purpose it is mounted together with its driving motor in a cradle which is arranged transversely or longitudinally of the axis of the car and is fixed by its ends on the longitudinals or cross members of the car. The compressor is driven by an electric motor likewise mounted on the cradle. The air to be compressed is drawn in through the motor casing which is made tight so that this ar rangement has the advantage of cooling the electric motor by ventilation. These features are likewise part of the invention. The motor-compressor group thus constituted has a very small weight and bulk for a given power and can be mounted very easily upon the chassis of the vehicle.

In the accompanying drawings:

Figure 1 is a sectiql f the improved com- :pressor, and

Fig. 2 is a side elevation of the motor-compressor group partly in section.

As shown, the cradle 1 ending in fixing lugs 2 and 3 carries on the left an electric motor 4 and on the'right the improved compressor.

The improved compressor is constructed as follows: I

Its lower part comprises a casing 5 containing the power-transmitting and receiving mechanism. The upper part of the .cas-- ing carries a set of cylinders 6 arranged in a circle. The cylinders of the set are connected together at their upper ends by a cylindrical collector 49 formed with the apertures for the valves, and they are connected together at their lower part by an annular base 34, and they are further connected at mid length by an annular assembling flange 38 to the said casing.

The casing 7 of the electric motor and the A casing 5 are assembled together in such a manner'as to form a single bearing composed of two parts 8 and 9 supporting by means of a set of bearing balls 10, the motor shaft 11 which drives through an Oldham joint the spindle 12 of a worm 13 whose end 1418 journaled in a thrust bearing 15 in the motor casing. The worm 13 meshes with a horizontal worm wheel 16 supported by a vertical journal 17 working in a footstep bearing '18 formed on the under side of the casing 5. The worm wheel 16 hasa boss containing a ball bearing 19.

To the lower annular base 34 of the set of cylinders there is bolted a bracket 20 serving to carry one of the axles 21 of a Cardan joint, of which the other axle at right angles carries a cap 22 extended downwardly by a pin 23 whose end is engaged in the inner ring of the ball bearing 19. Inside the chamber 24 of each cylinder there works a .piston 25 connected to a connecting rod 26.

This connecting rod terminates at its upper end in a ball 27 fixed in a central boss 28 of the piston by being clamped between a lower bearing step 29 which is suitably recessed, located the bottom of the cavity of the .said boss, and an upper bearing step 30 ,screwed above the ball 27 in the said cavity of said boss. At its lower part the connecting rod 26 terminates likewise in a'ball 31 fixed in a cavity of the cap 22 by means of a lower bearing step 32 engaged in the bottom of the said cavity, and an upper bearing step 33 pierced with a suitable aperture for the passage of the connecting rod and screwed in the cavity of the cap 22.so as to imprison the ball 31.

'The cylinder block 6 rests by means of its bottom rim 34 upon a seat 35 of the lower casing 5. This lower casing 5 extends up beyond the seat 35 in the form of a cyl1ndrical wall 36 terminating in a flange 37 fitting against a flange 38 provided at a suit able height on the cylinder block 6. The two flanges 37 38 are connected together by nutted bolts 39. By this arrangement, an annular space 40 is provided between the lower casing and the upper casing. The suction of the cylinders takes place through holes 41 opening into the space 40 comprised between the lower casing and the cylinder block. These holes are situated at such a height that they will be uncovered by the pistons 25 when the'latter are at the bottom of their stroke as shown in the right hand cylinder, and that they will not be uncovered when the pistons are at the top of their stroke as'shown in the left hand cylinder.

The suction of the compressor draws from the annular chamber 40, and this has the advantage of doing away with the noise caused by this suction. While at the same time any dust that has been carried in by the air will settle in this annular chamber and will not pass into the cylinders with the indrawn air. Since the suction holes 41 are not uncovered by the piston at the top of its stroke, the lubricating oil contained in the lower casing 5 and upon the moving parts, cannot be thrown out through these holes into the chamber 40, and thereby be drawn into the cylinders with the indrawn air.

In the motor-compressor group shown in the drawings, the suction takes place also through the completely air-tight casing of the electric motor 4, thus serving to cool the latter. This suction takes placethrough a tube 42 situated at the side of the collector, provided with a cap 43 arranged with perforated plates 44 and a metal filter 45 serving t arrest the dust. After the indrawn air has flowed between the motor and its casing, it passes into a pipe 46 connected to the suction chamber 40 after having passed through a metal filter 47 for arresting the dust, chiefly the dust which may have got through the collector 48 if the latter hashecome worn or faulty.

The upper part 6 of the compressor casing constitutes a delivery chamber 49 provided with a delivery pipe 50 into the lower art of which the delivery valves 51 open.

ach of these valves has a stem 52. guided in a part 53 fixed to the upper part of the delivery chamber 49. This guiding part 53 is held in place by a sleeve 54 which is itself held in position by a cap 55 screwed on the upper part of the delivery chamber 49. The valve 51 is kept pressed against its seat by a spring 56 bearing upon a cup washer 57 mounted on the upper end of the stem 52. A stud 58 screwed into the cap 55 and fastened by a lock nut 59, serves as an adjustable stop for the end of the valve stem 52. Owing to this arrangement, the spring 56 is situated in a chamber into which thecompressed gases do not enter, and the said spring is therefore protected from the def structive action of these hot gases.

In order to allow of regulating the piston U stroke and consequently the dead spaces at.

the bottom of the cylinders, the outer ring 60 of the ball bearing 19, carried by the worm wheel 16, has an outer surface which is eccentric relatively to its inner surface. It is screwed in this cavity in such a manner that by screwing it more or less in or out,

the inner ring of the ball bearing 19 can be moved farther away from or nearer to the center of the wheel 16, thereby increasing or diminishing the amplitude of the conical rocking movement of the pin23'of the cap, with the result of increasing or diminishing the piston stroke. j

What I claim is 1. A device of the type described compristioned means'to vary the extent of the rock- 1 ing movement of the cap member.

2. A device of the type described comprising an annular group of cylinders, pistons reciprocally mounted therein, a cap member mounted for universal movement, means connecting said cap member with said piston, a member rotatable in a plane perpendicular to the axis of the cylinders, means connecting the rotatable member and the cap member whereby rocking movement of the cap member is produced incident to rotation of the rotatable member, and means forvarymg the position of the connecting means with respect to the axis of the rotatable member for varying the extent of rocking movement of the cap member.

' 3. A device of the type described comprismg an annular group of cylinders, pistons reciprocally mounted therein, a cap member connecting said cap member with said pis tons, a member rotatable in a plane perpendicular to the axis of the cylinders, a pin carried by the rotatable member and engaged with the cap member for effecting rocking movement of the latter incident to rotation of the rotatable member, and an adjustable mounting for said pin for varying the position of the latter with respect to the axis of the rotatable member whereby the extent 10 of the rocking movement of the cap member may be varied.

In testimony whereof I have signed my name to this specification.

GASTON JULES DALOZ. 

